Let me state that I am not a Premium expert. Azure has a lot of offerings. Do you mean Azure storage? Or Azure Active Directory?
If you mean the former, we are using Premium Per User (PPU) and I don't think it requires Azure Storage. The Premium workspace comes with it's own capacity as part of the SaaS (Software as a Service) but we also have very limited ability to monitor or control it. And there are limitations based on how it shares capacity across the organization. But we don't have enough data to warrant managing our own Premium Capacity yet.
You might start with the documentation found here: https://learn.microsoft.com/en-us/power-bi/enterprise/service-premium-gen2-what-is.
I think they list a few "deep dive" webinars on those pages that may get you what you need.
And if you still have Qs, maybe reach out to your TAM (technical account manager) ... whoever manages your software licenses in your company should be able to put you in touch. Microsoft often has experts that can help answer your questions and get you started.
Best of luck!
